Holograpic Magnetic Stripe

Card Identification Data (CID)

A three-digit CID is printed in a separate box to the right of the signature panel on the card back. It ensures the cardholder possesses the card at the time of purchase.

The cardholder may choose to verify the CID during any authorization request for keyed or swiped transactions.

Discover Acceptance Mark

The Discover Acceptance Mark will appear on the front or back of the card.

Tamper-Evident Signature Panel

"DISCOVER" or "DISCOVER NETWORK" appears on a tamper-evident signature panel. Some cards contain an ultraviolet image that repeats the word "DISCOVER" in the signature panel.

Things to look for

Does the original signature panel show signs of tampering?

Is the word “VOID” exposed by an erasure?

Is the printing of the word(s) “DISCOVER” or “DISCOVER NETWORK” in the signature panel unclear or not tilted at the standard 20-degree angle?

“Valid Thru” Date

"Valid Thru" indicates the last month in which the card is valid.

Stylized "D"

On embossed cards, a security character appears as a stylized "D." A missing "D" on an embossed card may help you detect a counterfeit or altered Discover card.

On unembossed cards, no stylized "D" will appear.

Business Name

A business name may be embossed below the cardholder name.

Card Numbers

All Discover card numbers start with 6. On embossed cards, the card number should be uniform in size and spacing. On unembossed cards, the card number and expiration date are printed flat on the front.

Ultraviolet Effect

Under an ultraviolet light, "DISCOVER" or "DISCOVER NETWORK" will appear on the card.